I basically agree with Spino.

But I would not mind arrows sticking out of the ground. As said it would likely not take much time to create. And as such it loos very interesting to me. It would be cool to see where you have had a major archerduel, and arrows sticking out of bodies is not important, you can see the arrows in the ground and bodied among them. That would lead to an optical illusion of arrows sticking out of the bodies if looked at from 'afar', if done properly, if not we can still see they died from archery.
So go on that one.

The rest I don't really care about. Dead bodies and making them problematic, yes good enough but only as long as there are other problems. Make the AI ignore bodies for its pathfinding and give them a slowing factor.

Blood in RTW is not that important for me, and gore is certainly not. A bloodpool after a man has died is perfectly ok and enough for me, maybe a pool that will grow larger as more men are killed.